package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.result.PageResult;
import com.sky.result.Result;
import com.sky.service.DishService;
import com.sky.service.SetmealService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import springfox.documentation.annotations.Cacheable;

import java.util.ArrayList;
import java.util.List;

/**
 * 菜品
 * @author yangkexuan
 * @className DishServicelmpl
 * @date 2023/6/6 15:21
 * @description
 */
@Service
@Slf4j
public class DishServicelmpl implements DishService {
    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private DishFlavorMapper dishFlavorMapper;

    @Autowired
    private SetmealDishMapper setmealDishMapper;

    @Autowired
    private SetmealService setmealService;

    @Autowired
    private RedisTemplate redisTemplate;
    /**
     * 分类id查询菜品
     * @param categoryId
     * @return
     */
    @Override
    public List<DishVO> list(Integer categoryId) {
        DishPageQueryDTO dishPageQueryDTO = new DishPageQueryDTO();
        dishPageQueryDTO.setCategoryId(categoryId);
        return dishMapper.selectList(dishPageQueryDTO);
    }

    /**
     * name
     * @param name
     * @return
     */
    @Override
    public List<DishVO> listByName(String name) {
        DishPageQueryDTO dishPageQueryDTO = new DishPageQueryDTO();
        dishPageQueryDTO.setName(name);
        return dishMapper.selectList(dishPageQueryDTO);
    }

    /**
     * 菜品分页查询
     * @param dishPageQueryDTO
     * @return
     */
    @Override
    public PageResult page(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(),dishPageQueryDTO.getPageSize());
        Page<DishVO> dishList = (Page<DishVO>)dishMapper.selectList(dishPageQueryDTO);
        return new PageResult(dishList.getTotal(),dishList.getResult());
    }

    /**
     * 菜品起售,停售
     * 菜品停售同时会导致套餐停售
     * @param status
     * @param id
     */
    @Override
    @Transactional(rollbackFor = Exception.class)
    public void startOrStop(Integer status, Long id) {
        Dish dish = Dish.builder()
                .status(status)
                .id(id)
                .build();
        dishMapper.updateStatus(dish);

        if(status.equals(StatusConstant.DISABLE)){
            //根据菜品id查询关联的套餐的ID
            List<Long> setmealId = setmealDishMapper.selectSetmealIdByDishId(id);
            //如果有的话菜品停售套餐也会停售
            if(!setmealId.isEmpty()){
                for (Long aLong : setmealId) {
                    setmealService.startOrStop(StatusConstant.DISABLE,aLong);
                }
            }
        }
    }

    /**
     * 新增菜品 和 对应口味
     * @param dishDTO
     */
    @Transactional(rollbackFor = Exception.class)
    @Override
    public void saveWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        //向菜品表插入1条数据
        dishMapper.insert(dish);
        //获取insert语句生成的主键值
        Long dishId = dish.getId();

        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && !flavors.isEmpty()) {
            flavors.forEach(dishFlavor -> {dishFlavor.setDishId(dishId);});
            //向口味表插入n条数据
            //后绪步骤实现
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    /**
     * 菜品批量删除
     * @param ids
     */
    @Override
    @Transactional(rollbackFor = Exception.class)
    public void delete(List<Long> ids) {
        //判断当前菜品是否能够删除---是否存在起售中的菜品
        Integer num = dishMapper.selectNumById(ids);
        if(num > 0){
            throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
        }
        //判断当前菜品是否能够删除---是否被套餐关联了？？
        List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(ids);
        if (setmealIds != null && !setmealIds.isEmpty()) {
            //当前菜品被套餐关联了，不能删除
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }

        //删除菜品表中的菜品数据
            dishMapper.deleteById(ids);
            //删除菜品关联的口味数据
        for (Long id : ids) {
            dishFlavorMapper.deleteByDishId(id);
        }

    }

    /**
     * 查询回显
     * @param id
     * @return
     */
    @Override
    public DishVO getByIdWithFlavor(Long id) {
        //根据id查询菜品数据
        Dish dish = dishMapper.getById(id);

        //根据菜品id查询口味数据
        List<DishFlavor> dishFlavors = dishFlavorMapper.getByDishId(id);

        //将查询到的数据封装到VO
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish, dishVO);
        dishVO.setFlavors(dishFlavors);

        return dishVO;
    }

    /**
     * 根据id修改菜品基本信息和对应的口味信息
     * @param dishDTO
     */
    @Override
    public void updateWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);

        //修改菜品表基本信息
        dishMapper.update(dish);

        //删除原有的口味数据
        dishFlavorMapper.deleteByDishId(dishDTO.getId());

        //重新插入口味数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && !flavors.isEmpty()) {
            flavors.forEach(dishFlavor -> dishFlavor.setDishId(dishDTO.getId()));
            //向口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    //----------------------------------用户端代码----------------------------------------
    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    @Override
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);
        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }
        //将查到的数据放到Redis中
        log.info("Redis已加载菜单数据");
        return dishVOList;
    }

}
